PRODUCT DATASHEET
AAT2861
ChargePump
TM
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
Typical Characteristics
Operating Characteristic
LDO Output Voltage Deviatoin (%)
(V
IN
= 3.0V;
20mA/ch Backlight; 2X Mode; C
OUT
= 2.2µF)
Charge Pump
Output Voltage
(AC coupled) (bottom) (mV)
Input Voltage
(AC coupled)
(top) (mV)
20
10
0
20
10
0
-10
-20
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
0.1
1
10
100
1000
LDO A/B/C Load Regulation
(V
IN
= 3.6V)
V
OUT
= 1.8V
V
OUT
= 3.0V
Time (500ns/div)
Load Current (mA)
LDO A/B/C Output Voltage vs. Temperature
LDO Output Voltage Deviatoin (%)
(V
IN
= 3.6V; I
LDO
= 0mA)
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-40
LDO A/B/C Load Transient Response
(I
LDO
= 10mA to 200mA;
V
IN
= 3.6V;
V
LDO
= 1.8V;
C
LDO
= 2.2µF)
LDO Output Current
(top) (mA)
V
OUT
= 1.8V
V
OUT
= 3.3V
200
100
0
-100
-200
-300
-400
-500
2.00
1.90
1.80
1.70
1.60
LDO Output Voltage
(bottom) (V)
-15
10
35
60
85
Temperature (°C)
Time (20µs/div)
LDO A/B/C Line Transient Response
(V
IN
= 3.6V to 4.2V;
I
LDO
= 10mA;
V
OUT
= 1.8V;
C
LDO
= 2.2µF)
4.4
4.0
LDO A/B/C Turn On Characteristic
(V
LDO
= 1.8V;
V
IN
= 3.6V;
C
LDO
= 2.2µF)
LDO Output (bottom) (V)
LDO Output Voltage
(bottom) (V)
Input Voltage
(top) (V)
4.0
3.6
1.82
1.81
1.80
1.79
1.78
V
ENLDOX
(top) (V)
2.0
0.0
1.5
1.0
0.5
0.0
Time (1ms/div)
Time (20µs/div)
8
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2861.2009.02.1.2
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
